<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        div {
            font-size: 100px;
        }
        .atguigu1 {
            font-weight: lighter;
        }

        .atguigu2 {
            font-weight: normal;
        }

        .atguigu3 {
            font-weight: bold;
        }

        .atguigu4 {
            font-weight: bolder;
        }
    </style>
</head>
<body>
    <div class="atguigu1">尚硅谷1abc</div>
    <div class="atguigu2">尚硅谷2abc</div>
    <div class="atguigu3">尚硅谷3abc</div>
    <div class="atguigu4">尚硅谷4abc</div>
    
</body>
</html>